From the bestselling author of the generation-defining series The Baby-sitters Club comes a series for a new generation! Stay away, spots! Halloween is coming! There will be a party at school. and Karen, Hannie, and Nancy have planned the best costume ever. Then Karen’s little sister gets the chicken pox. It is very contagious. Karen does not want to catch chicken pox. If she does, it will ruin Halloween. And that would be really scary!

Karen's little sister gets the chicken pox just before Halloween, and Karen doesn't want to get it and not get to wear her best costume ever.

From the bestselling author of the generation-defining series The Baby-sitters Club comes a series for a new generation! Write on!Everybody in the big house is busy. And Karen is b-o-r-e-d. She tries to read a book. But then she has a better idea! She will write her own book! It will be about her life. She does not remember everything about being little. So she talks with Mommy and Daddy. They tell Karen all the funny things she did. Can Karen write a whole book?

From the bestselling author of the generation-defining series The Baby-sitters Club comes a series for a new generation! Good-bye, Stoneybrook!Karen is moving to Chicago for six months, with Mommy, Andrew, and Seth. Karen wants to be with her little-house family. But leaving her big-house family will be hard. And Karen will miss her friends and her school a lot too. She will try her best to like Chicago. But what if she misses Stoneybrook too much?

From the bestselling author of the generation-defining series The Baby-sitters Club comes a series for a new generation! Double TroubleTammy and Terri are real-life twins in Karen’s class. Audrey thinks that is really neat. She wants to be a twin, too. And her twin is going to be Karen. Karen likes being audrey’s twin at first. But then Audrey does everything just like Karen. She dresses like her, she talks like her, and she even looks like Karen! How can there be two Karens at once?

Karen is not the little sister anymore now that baby Emily is in their family.

From the bestselling author of the generation-defining series The Baby-sitters Club comes a series for a new generation! A difficult guestKaren’s favorite cousin is coming to visit. Karen will bring her to an Easter egg hunt and even to the Easter parade! She plans to be the best host ever. But it is not so easy. Diana wants to do things that will get Karen in trouble. Karen wants to stop her. But can she do it without ruining their visit -- or ruining Easter?